code: def testListAndUnionDispatch(self):
      dispatcher = dispatch.PythonAPIDispatcher(
          "tf.foo", ["x", "ys", "name"], (None,)
      )
  
      rt_checker = dispatch.MakeInstanceChecker(
          ragged_tensor.RaggedTensor
      )
      tensor_checker = dispatch.MakeInstanceChecker(tensor.Tensor)
      rt_or_t = dispatch.MakeUnionChecker([rt_checker, tensor_checker])
      list_of_rt_or_t = dispatch.MakeListChecker(rt_or_t)
      f1 = lambda x, ys, name=None: "f1"
      dispatcher.Register(
          dispatch.PySignatureChecker(
              [(0, rt_or_t), (1, list_of_rt_or_t)]
          ),
          f1,
      )
  
      rt = ragged_factory_ops.constant([[1, 2], [3]])
      t = constant_op.constant(5)
      self.assertEqual(dispatcher.Dispatch((rt, [t]), None), "f1")
      self.assertEqual(dispatcher.Dispatch((rt, [rt]), None), "f1")
      self.assertEqual(dispatcher.Dispatch((t, [rt]), None), "f1")
      self.assertEqual(dispatcher.Dispatch((rt, []), None), "f1")
      self.assertEqual(
          dispatcher.Dispatch((t, [t, t, rt, t]), None), "f1"
      )
      self.assertEqual(
          dispatcher.Dispatch((rt, [t], "my_name"), None), "f1"
      )
      self.assertEqual(
          dispatcher.Dispatch((), {"x": rt, "ys": [t]}), "f1"
      )
      self.assertEqual(
          dispatcher.Dispatch((), {"x": rt, "ys": [t], "name": "x"}),
          "f1",
      )
      self.assertEqual(
          dispatcher.Dispatch((t, [t]), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch((t, []), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", [rt]), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", "bar"), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", "bar", "baz"), None),
          NotImplemented,
      )
  
imports: import collections
  import numpy
  from tensorflow.python.framework import _pywrap_python_api_dispatcher
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 3 for calling the PythonAPIDispatcherTest obj's underlying member method code with example usage: obj.testListAndUnionDispatch() without return types